patman: Add Series-process-log tag to sort/uniq change logs

For some series with lots of changes it is annoying that duplicate change
log items are not caught. It is also helpful sometimes to sort the change
logs.

Add a Series-process-log tag to enable this, which can be placed in a
commit to control this.

The change to the Cc: line is to fix a checkpatch warning.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Doug Anderson <dianders@chromium.org>

tools/patman/README

@@ -225,9 +225,16 @@ Series-changes: n
 	to update the log there and then, knowing that the script will
 	do the rest.
 
-Cc: Their Name <email>
+ Cc: Their Name <email>
 	This copies a single patch to another email address.
 
+Series-process-log: sort, uniq
+	This tells patman to sort and/or uniq the change logs. It is
+	assumed that each change log entry is only a single line long.
+	Use 'sort' to sort the entries, and 'uniq' to include only
+	unique entries. If omitted, no change log processing is done.
+	Separate each tag with a comma.
+
 Various other tags are silently removed, like these Chrome OS and
 Gerrit tags:
 

tools/patman/patchstream.py

@@ -46,7 +46,7 @@ re_cover = re.compile('^Cover-letter:')
 re_cover_cc = re.compile('^Cover-letter-cc: *(.*)')
 
 # Patch series tag
-re_series = re.compile('^Series-(\w*): *(.*)')
+re_series = re.compile('^Series-([a-z-]*): *(.*)')
 
 # Commit tags that we want to collect and keep
 re_tag = re.compile('^(Tested-by|Acked-by|Reviewed-by|Cc): (.*)')

tools/patman/series.py

@@ -28,7 +28,7 @@ import terminal
 
 # Series-xxx tags that we understand
 valid_series = ['to', 'cc', 'version', 'changes', 'prefix', 'notes', 'name',
-                'cover-cc']
+                'cover-cc', 'process_log']
 
 class Series(dict):
     """Holds information about a patch series, including all tags.
@@ -167,15 +167,20 @@ class Series(dict):
             etc.
         """
         final = []
+        process_it = self.get('process_log', '').split(',')
+        process_it = [item.strip() for item in process_it]
         need_blank = False
         for change in sorted(self.changes, reverse=True):
             out = []
             for this_commit, text in self.changes[change]:
                 if commit and this_commit != commit:
                     continue
-                out.append(text)
+                if 'uniq' not in process_it or text not in out:
+                    out.append(text)
             line = 'Changes in v%d:' % change
             have_changes = len(out) > 0
+            if 'sort' in process_it:
+                out = sorted(out)
             if have_changes:
                 out.insert(0, line)
             else: